Eyes have many mysterious things, the color of a person's eyes can determine a person's strength. This is the story of Retto who woke up in the body of a slave and his sleeping distance is about 10,000 years.

"what eye knowledge begins to decline?"

With the Title of Alchemy Emperor in the past. Now he wants to try martial arts. Drawing a sword over one earth and under one sky. Shake the continent and the world.

Reaching the peaks and mysteries of nature that he had never known from the past. This is the story of Retto's adventures.

Blue Perception